One vertex per element, one color per generator, with an edge from x to x·s.
(9,10)(11,15)(12,16)(13,14)(17,18)(19,21)(20,23)(22,30)(24,26)(25,32)(27,28)(29,31) involution — undirected(1,2)(3,7)(4,5)(6,8)(10,14)(11,16)(17,19,24,23)(18,21,26,20)(22,27,32,31)(25,29,30,28)(2,5)(6,7)(9,11)(10,12)(13,16)(14,15)(17,20,24,21)(18,19,26,23)(22,28,32,29)(25,27,30,31)(1,3,4,8)(2,6,5,7)(9,11)(10,12)(13,16)(14,15)(17,21,24,20)(18,19,26,23)(22,29,32,28)(25,27,30,31)(9,12)(10,11)(13,15)(14,16)(17,22,24,32)(18,25,26,30)(19,27,23,31)(20,28,21,29)(1,2)(3,6)(4,5)(7,8)(17,23,24,19)(18,20,26,21)(22,31,32,27)(25,28,30,29)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.